I can't quite help you with the functionality of those handle options yet, but I have recently bought all of them.
I have the G2 Carbon Full Handle for the X-Ray MB-736 and have it installed already, but haven't fished with it yet.
I have the G2 Carbon Split Grip Handle for the X-Ray MB-733 as a spinning rod and it's dry fitted right now, but I'm waiting to receive the G2 trim fittings that I had to order after dry fitting and measuring the blank to get get the right size. The G2 Full Handle comes with the trim fittings already, the G2 Split Grip Handle, you have to order them separately.
I have the CFX Full Handle Grips for a X-Ray MB-7109 build, but have not started building it yet.
I have the black Split Grip Winn Grips I just put on a Phenix X-10 Composite build a couple of days ago, but have not fished with it yet.
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I can give you some of my initial impressions and thoughts on them though.
The G2 Handles seem like they will be the most sensitive just by going by some small testing. The full grip handles only have two small arbor rings inside and the rest is hollow inside and the split grips only have one small arbor ring in each section. It reduces weight and I think reflects vibration better than any other type of handle by far.
But, they have their down sides. They have no grip and might get slippery when wet. The other downside is you need a AT G2 reel seat, which are awesome, but don't come in specific id sizes. So I had to get an insert for them because I wanted the exposed reel seats. Now, on one of them I didn't use an insert, but instead used a Carbon Fiber Rod Skin with some finish on top to make it thick enough so the reel seat fit tightly. FYI, I have the G2 CCT Razor and Blade Carbon reel seats, which are the best two offered and while both are awesome, the Razor is the bomb.
As far as the CFX Handles goes, those are the only ones I haven't reamed out and at least dry fitted yet, but they look nice, have some grip to them and are light, so I'm sure I'm going to like them and I don't see much of a down side to them.
Winn Grips of course are going to give you the most grip and they look pretty good too, but I think they will be the less sensitive out of the three, hence why I put them on my crankbait rod. They were also the messiest to ream out and I had to keep cleaning my reamer.
My thoughts were to put the G2 Carbons on my two setup that I wanted the most sensitivity out of, MB-736 and MB-733. I wanted some comfort, but still wanted that sensitivity for my power rod, so I went with the CFX. For my crankbait rod I wanted grip more so than sensitivity, especially with it being the rod that will be in my kayak 100% of the time and the probability that it will get wet the most. Plus it will be my jerkbait rod for now and I don't want a slippery handle for that technique.
So for me they all have their advantages, with the CFX kind of being the middle ground with both grip and sensitivity. But, if you asked my wife, she would choose the Winn Grips because she likes the way they feel.
Top to bottom
X-Ray MB-7109 Blank
CFX Full Handle Grip + EC-22 Butt Cap + AT G2 Vibe Reel Seat + Fuji Alconite Guides, Spiral Wrapped ( Awaiting G2 Insert for Vibe Reel Seat)
Phenix X-10 Composite Blank + Spit Grip Winn Grips + AT G2 CCT Razor Reel Seat + G2 Insert + G2 Carbon Foregrip Sleeve + Fuji SiC Guides
X-Ray MB-733 + G2 Carbon Split Grip (Bushido) + AT CCT AERO Reel Seat + Fuji Titanium SiC Guides ( Awaiting Trim Fittings for Handle)
X-Ray MB-736 + G2 Carbon Full Handle 9" (Matte) + AT CCT Blade Reel Seat + Carbon Fiber Rod Skin under Reel Seat + G2 Carbon Foregrip Sleeve + Fuji Titanium Torzite Guides, Spiral Wrapped